Researchers recently discovered what was thought to be a distinct species of butterfly is actually the female of a species known to science for more than a century.
An international team of nine butterfly researchers from the U.S., Brazil, the U.K...

The well-preserved skull of an extinct tortoise species. Florida Museum of Natural History photo courtesy of Nancy Albury
An extinct tortoise species that accidentally tumbled into a water-filled limestone sinkhole in the Bahamas about 1,000 year...